REFLECTOR:Firewall penetrations (was Control Cables)
Ronnie Brown
reflector@tvbf.org
Sat, 6 Mar 2004 13:00:56 -0500
Hi Larry,
I do have a 70 amp breaker as well as an ammeter shunt on the firewall in
the wire between the alternator and starter. Of course, the breaker can't
be reset - but if the breaker trips - it is because there is something wrong
that needs to be repaired - a shorted wire or alternator.
This wiring arrangement was from Aeroelectric Bob's manual - although I
don't have it with me now - I loaned it out.
Ronnie
----- Original Message -----
From: "Laurence Coen" <lwcoen@hotmail.com>
To: <reflector@tvbf.org>
Sent: Saturday, March 06, 2004 11:18 AM
Subject: Re: REFLECTOR:Firewall penetrations (was Control Cables)
| Ronnie,
|
| I think there are a couple of problems with your approach of connecting
the
| alternator to the starter hot terminal. First, you should use a fusible
| link to make the connection. This is to prevent a fire should the
| alternator fail in short circuit mode. I have never met an aircraft that
| didn't have a circuit breaker in the alternator battery connection. If
you
| want an ammeter it would have to be wired into the battery lead which
means
| that starter motor load would go through the ammeter. A 60 amp device
would
| be fried on the first startup. My advice would be to do it the way that
Jim
| Agnew suggests.
|
| Larry Coen
| Std. RG/E Franklin
| N136LC
|
| ----- Original Message -----
| From: "Ronnie Brown" <romott@adelphia.net>
| To: <reflector@tvbf.org>
| Sent: Saturday, March 06, 2004 8:12 AM
| Subject: Re: REFLECTOR:Firewall penetrations (was Control Cables)
|
|
| > But you still have a hot wire running back to the engine - for the
| > alternator. It is a pretty healthy #8 or perhaps #10 for a 50-60 amp
| > alternator.
| >
| > If you run the starter cable hot off the main contactor, then you don't
| need
| > the extra wire for the alternator. Just connect the alternator to the
hot
| > cable on the starter.
| >
| > Both methods are fine.
| >
| > Ronnie Brown
| >
| > ----- Original Message -----
| > From: "Pat Shea" <xl340hp@yahoo.com>
| > To: <reflector@tvbf.org>
| > Sent: Friday, March 05, 2004 6:31 PM
| > Subject: Re: REFLECTOR:Firewall penetrations (was Control Cables)
| >
| >
| > | Jim,
| > |
| > | Actually, my starter solenoid is up front w/ the
| > | master. I just didn't like that + #2 wire being
| > | exposed in the engine compartment, and it just seemed
| > | like everything convenient to clamp it to and
| > | immediately surrounding it was grounded! Granted, if
| > | it becomes shorted, you'll probably discover that the
| > | next time you go to engine start. That's a lot better
| > | than in flight, but probably still not a pleasant
| > | experience. Anyway, cheap insurance.
| > |
| > | Pat
| > |
| > | --- Jim Agnew <jim_agnew_2@yahoo.com> wrote:
| > | > Pat,
| > | >
| > | > A far better and safer way is to place the starter
| > | > solenoid
| > | > up front next to the master solenoid and then your
| > | > starter
| > | > + cable is dead and much safer except during
| > | > starting.
| > | >
| > | > Jim
| > | >
| > | > --- Pat Shea <xl340hp@yahoo.com> wrote:
| > | > > Hi Keith,
| > | > >
| > | > > In terms of fireproofing, what are you planning on
| > | > > doing w/ the duct openings on the lower firewall?
| > | > >
| > | > > After Bill Huen's incident, I decided to also
| > | > > firesleeve my + battery lead from the firewall to
| > | > the
| > | > > starter.
| > | > >
| > | > > Pat
| > | > >
| > | > >
| > | > > --- KeithHallsten <KeithHallsten@quiknet.com>
| > | > wrote:
| > | > > > I would suggest that we all consider maintaining
| > | > the
| > | > > > integrity of our firewalls where control cables,
| > | > > > intrument wires, etc. pass through. Here's a
| > | > link
| > | > > > to an outfit that has this problem handled.
| > | > > > http://www.epm-avcorp.com/tubeseal.html
| > | > > >
| > | > > > I plan to use this general scheme for my aileron
| > | > > > control cables (with firesleeve over the entire
| > | > > > length within the engine compartment) as well as
| > | > the
| > | > > > throttle, mixture, prop and wiring penetrations
| > | > > > (with just the short sealing firesleeve).
| > | > > >
| > | > > > Keith Hallsten, XLFG
| > | > >
| > | > >
| > | > > __________________________________
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| > | >
| > | > =====
| > | > James F. Agnew
| > | > Jim_Agnew_2@Yahoo.Com
| > | > Tampa, FL
| > | > Velocity 173 Elite Aircraft Completed & Flying
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| > |
| > |
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